Periods of the Manor

Rosenlew remained the owner of the Manor until the year 1941. There were two candidates to take up ownership: President Risto Ryti and the extremely wealthy German weapons manufacturer Willy Daugs. Permission for purchase went to Daugs and the Manor didn't become the President's summer home as planned. However, following Germany's loss in WWII, the German property was transferred to Soviet possession in compensation. The Manor was overseen by the board for Soviet property, and during this time the Main Building was left empty and fell into disrepair.

Yrjö Sirola rented the house in 1947, and it began to house the Sirola College. In 1956 the Sirola Foundation bought the buidings and the land. More than half of the land was given to veterans to use as small farms and land for houses, leaving the other half to what was Vanaja municipality at the time. Sirola College was finally shut down in 1994.

Two years later, Hämeenlinna City Council bought the estate, and it was leased by Vanajanlinna Oy, partly owned by the Sirola Foundation. In 1998, Mika Walkamo and Pekka Vihma became owners of Vanajanlinna Oy, and began running a Conference Hotel on the estate.